Avian Egg-Related Coelomitis Study Guide

Overview and Clinical Importance

Egg-related coelomitis (formerly called egg yolk peritonitis) describes an acute or chronic, usually diffuse, inflammation of the coelomic cavity involving egg yolk, egg albumin, and/or eggshell material, occurring with or without bacterial infection. The term "egg yolk peritonitis" has fallen out of favor because birds have a coelom rather than a true peritoneum, and the offending substance may include not just yolk but other components of the egg.

This condition is one of the most common reproductive emergencies encountered in avian practice. It occurs when egg material escapes normal passage through the oviduct and enters the coelomic cavity, triggering inflammation and often secondary bacterial infection. The condition can be life-threatening and requires prompt recognition and appropriate treatment.

Avian Female Reproductive Anatomy

Understanding the unique anatomy of the avian female reproductive system is essential for recognizing how egg-related coelomitis develops. Unlike mammals, most birds have only a single functional left ovary and oviduct. The right ovary and oviduct typically regress during embryonic development.